CVE-2025-66862
📋 TL;DR
A buffer overflow vulnerability in the gnu_special function of BinUtils' cplus-dem.c file allows attackers to crash applications by processing specially crafted PE files. This affects systems using BinUtils 2.26 for binary analysis or demangling operations. The vulnerability can lead to denial of service in affected applications.
💻 Affected Systems
- BinUtils
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to denial of service, potentially affecting system stability if critical services use vulnerable BinUtils components.
Likely Case
Application crashes when processing malicious PE files, causing temporary service disruption.
If Mitigated
Limited impact with proper input validation and sandboxing of file processing operations.
🎯 Exploit Status
Proof of concept demonstrates crash via crafted PE file. Exploitation requires delivering malicious file to vulnerable processing pipeline.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BinUtils 2.27 or later
Vendor Advisory: https://sourceware.org/bugzilla/show_bug.cgi?id=XXXXX
Restart Required: No
Instructions:
1. Check current BinUtils version with 'objdump --version' or 'c++filt --version'. 2. Upgrade to BinUtils 2.27 or later from official repositories. 3. Recompile any applications linked against vulnerable BinUtils libraries.
🔧 Temporary Workarounds
Disable PE file processing
allPrevent BinUtils tools from processing PE files where not required
# Configure applications to avoid using BinUtils for PE file analysis
# Use alternative tools for PE file processing
Input validation
linuxImplement strict validation of PE files before processing with BinUtils
# Add file type verification before passing to vulnerable functions
# Use 'file' command to verify file types: file --mime-type input_file
🧯 If You Can't Patch
- Isolate BinUtils usage to trusted environments only
- Implement strict access controls on file upload/processing systems
🔍 How to Verify
Check if Vulnerable:
Run 'objdump --version' or 'c++filt --version' and check if version is 2.26. Test with known safe PE files to see if processing causes crashes.Check Version:
objdump --version | head -1Verify Fix Applied:
After upgrade, verify version is 2.27 or later. Test processing of previously crashing PE files to confirm stability.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in application logs
- Core dumps from BinUtils-related processes
- Abnormal termination of cxxfilt or objdump processes
Network Indicators:
- Unusual PE file uploads to processing systems
- Multiple failed processing attempts
SIEM Query:
process.name: ("c++filt" OR "objdump") AND event.outcome: failure